Novel Chain Extenders

Patent Title: METHOD OF PRODUCING FIVE-CARBON RING-CONTAINING COMPOUND AND FIVE-CARBON RING DERIVATIVE-CONTAINING POLYURETHANE, AND FIVE-CARBON RING DERIVATIVE-CONTAINING POLYURETHANE

Number/Link: US2019/0048123

Applicant/Assignee: CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY

Publication Date: 14-February 2019

Gist”: Novel chain extenders are derived from dicyclopentadiene (DCPD)

Why it is interesting: DCPD is a by-product of ethylene production by steam cracking of naphta.  It is produced in large quantities and it makes sense to search for new applications.  According to this invention, the compound shown below can be prepared by first ‘degrading’ DCPD to cyclopentadiene, followed by reaction with phenol to produce 4-(cyclopent-2-enyl)phenol which is then converted to 4-cyclopentenylphenol (translocation of the double bond).  The cyclopentenylphenol is then reacted with phenol followed by reaction with ethylene carbonate to produce the chain extender. In an example the chain extender is reacted with a 4,4′-MDI prepolymer in solvent.
Clever chemistry and an interesting compound, but its usefulness remains to be shown.

extender

Chain extender according to the invention

Low Viscosity Polyester Polyols

Patent Title: LOW VISCOSITY POLYOLS FOR POLYURETHANE APPLICATIONS

Number/Link: WO2019/010018

Applicant/Assignee: Stepan

Publication Date: 10 January 2019

“Gist”: Polyester polyol containing lactide

Why it is interesting:  The invention relates to low viscosity polyester polyols for use in crosslinked polyurethane coating compositions. The polyols are prepared from a polycarboxylic acid, one or more polyols and 5-35% lactide. In an example adipic acid is reacted with lactide, neopentyl glycol and trimethylolpropane. Coatings made from these polyols are said to have improved hardness and solvent resistance and a low VOC content.

lactide

Lactide

TPU with High EMR Permeability

Patent Title: POLYURETHANES WITH GOOD PERMEABILITY FOR ELECTROMAGNETIC RADIATION

Number/Link: WO2019/002350 (German)

Applicant/Assignee: BASF

Publication Date: 3 January 2019

“Gist”:  TPU based on aliphatic polycarbonate diol

Why it is interesting: The invention relates to thermoplastic polyurethanes with a high permeabilty to electromagnetic radiation, especially in the 0.5 to 3 GHz frequency range. (I assume these materials are aimed at mobile phone covers and the like). ‘Surprisingly’ it was found that such TPUs can be prepared from polycarbonate diols which are based on butanediol, pentanediol or hexanediol. In the examples, TPUs based on these diols together with BDO and 1,6-HDI or 4,4′-MDI, show a lower dielectric loss factor at 400 MHz as compared to TPUs based on other polyols.

TPU cover

TPU mobile phone case.

 

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